level of 131 mg / 100 ml is not a diabetic level. Fasting >126 mg and pp >200 mg per 100 ml of blood is considered diabetic level. Your level is normal. To avoid possibility of diabetes
keep exercising regularly for at least 1 or more per day, avoid to many sweets, direct sugar, deep fired foods, junk foods and pastries. Keep weight in check, as near as possible to normal.